Description Sets In 3-5 Minutes. Stops Flowing Water Or Seepage Under Pressure Through Holes And Cracks, And Can Even Be Applied Under Water. Expands As It Sets To Provide A Permanent, High Strength Patch. WARNING: This product can expose you to chemicals including Lead which is known to the State of California to cause cancer, birth defects or reproductive harm and Butyl Benzyl phthalate (BBP) which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov